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by Craig Shallahamer Get the book here |
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Craig Shallahamer's Blog
The text below is an except from the book, Oracle Performance Firefighting, written by Craig Shallahamer of OraPub, Inc. Figures and tables are not included on this page, only their reference. To order the book in either print or PDF form, click here. ©2009, 2010 by Craig Shallahamer. This is copyrighted material. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. ------------------------------- * The log writer background process posts the log file parallel write wait event, not a server process. The closest a server process will get to directly feeling the log file parallel write wait is when posting a log file sync or log buffer space wait events. Therefore, when using a report similar to Figure 8-17, a Statspack, or an AWR report, you should look for the highest elapsed time DML SQL. The report shown in Figure 8-17 is a stripped-down version of Oracle's OSM topdml.sql report. There are many other columns of useful information that could be added to help identify the offending SQL and locate its application source. Identifying where in the application the SQL occurs is the first step in determining if the SQL statement itself, its application area, or its execution rate can be altered to reduce redo creation. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. |
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